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Net Loss Per Share (Tables)
 12 Months Ended
Jan. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Calculation of Numerator and Denominator in Net Loss Per Share The following table sets forth the computation of the numerators and denominators used in the basic and diluted net loss per share amounts:
 
Fiscal Year Ended January 31,
 
2019
 
2018
 
2017
Numerator:
 
 
 
 
 
Net loss
$
(80.8
)
 
$
(566.9
)
 
$
(582.1
)
Denominator:
 
 
 
 
 
Denominator for basic net loss per share—weighted average shares
218.9

 
219.5

 
222.7

Effect of dilutive securities (1)
—

 
—

 
—

Denominator for dilutive net loss per share
218.9

 
219.5

 
222.7

Basic net loss per share
$
(0.37
)
 
$
(2.58
)
 
$
(2.61
)
Diluted net loss per share
$
(0.37
)
 
$
(2.58
)
 
$
(2.61
)

____________________ 
(1)
The effect of dilutive securities of 3.1 million, 4.5 million, and 4.6 million shares for the fiscal years ended January 31, 2019, 2018, and 2017, respectively, have been excluded from the calculation of diluted net loss per share as those shares would have been anti-dilutive due to the net loss incurred during those fiscal years.